Sorry phil, I was assuming it was a loose diff from the sellers details.
So are all auto's bolted then - I suppose there has to be some benefit to having a dull-box
The main problem with a welded car is there are numerous different crown wheel sizes for all the models and final drive ratios, so unless you get YOUR crown wheel machined off, where can you get another 'loose' crownwheel of your required size / number of teeth?